Quote:
Originally posted by Undertoad
An FBI analysis of the shoes showed the bombs were made of two explosives -- a military explosive called PETN and a homemade explosive called TATP. Experts said they have not previously seen that combination.
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PETN has both military and commercial uses. The interesting thing about TATP IMO is that it's not a nitrate-based explosive -- which means those "sniffers" won't detect it.